6v charger regulator

[stuee]

Hi, im adding lights and  a battery to my dirt bike, i lights and battery now and a regulator to stop voltage higher than 6v. but also want to put a regulator on the stator so it doesent over charger the battery, is ther ea schematic for that anywhere?
thanks

 

[ante1]

Hi stuee,

We need the data for the alternator (Volts & Amps) and the battery (type & Ah) you like to charge.

 

[stuee]

hi, unsure the amp of stator but the voltage goes upto 8v on high revs so ive got a voltage regulator upto 3amp to put on it so it doent keep blowing my 6v bulbs, i was thinking of putting the regulator between the battery and stator so it keeps the voltage at 6v constant and doesnt excees 3amps if thats any help.  thae battery is 6v 4.2AH

thanks

 

[audioguru2]

A 6V lead-acid battery isn't 6.0V. It is fully charged and is trickle-charged at between 6.9V and 7.2V.
The headlight on your bike might draw 10A which would come from the voltage regulator. If the voltage regulator cannot supply the current then the headlight won't light.
Most electronic voltage regulators don't work unless the input voltage is at least 2.5V more than the output voltage. They won't work on your bike.

 

[stuee]

so can you tell me what your solution is for this, the bits i have are... 6v 35w headlight. a 6v 4.2AH sealed rechargable battery. (Diamec) 4x l7806cv to pigyback to get 4amp. what can you suggest? perhaps a higher 12v regulator and resistor it? and same for the charging?

Thanks

 

[audioguru2]

Your battery charges at about 7V, so the 7806 regulators have too low a voltage.
A couple of diodes in series with the regulators would raise their voltage to 7.4V which is too high. One diode would raise the voltage to 6.7V which is too low.
The 7806 regulator needs an input voltage of at least 8.5V to regulate properly and higher if diodes are used to raise the voltage.

Your headlight needs 35W/6V= 5.8A when hot and much more when cold, which 4 regulators cannot supply.

A 12V regulator won't work because your system doesn't have a 14.5V input for it.
A resistor isn't a voltage regulator.

Look at how a car regulates the voltage from its alternator. It adjusts a small current in its field coil which regulates its output voltage. Maybe your bike has an alternator and maybe it has a field coil. Maybe your bike has a magneto for its ignition which cannot supply the power to operate a headlamp.

 

[stuee]

i was speaking to a small coil winders who informed me that the wire that was snipped off inside the flywheel is the lights / axuliry cable, the ingnition is a totally seperate winding. so i have 1 wire and the bike ground.

 

[stuee]

ok, what if i just scrap the battery and just use the power to a splitter for headling switch and one to the brake light switch, i will still need a regulator so it doesnt keep blowin fuses. what should i use?

 

[audioguru2]

Couldn't you get a real alternator with built-in voltage regulator that is made for a real motorcycle?

 

[stuee]

no because the bike is a scrambler dirt bike and not made for lights, but need to put them on so i can recreational register it. as the last fine for $380 was a bit annoying for the sake of regstering it for $100

 

[audioguru2]

the bike is a scrambler dirt bike and not made for lights

There is your problem.

 

[stuee]

i know, but like i said, i have power.

I have a power cable from the magneto, if i put a globe on it its ok, till i rev then it blows, i just want it so it wont blow them,, then i can ge tthe bike registered!